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POPFLEX to Spanx leggings size

The short answer

POPFLEX XXS is Spanx XS by the two brands' own charts. 4 of 9 POPFLEX sizes land on a different label at Spanx.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

Every POPFLEX size read across to Spanx. Letter sizes on the left, Letter on the right.
POPFLEXPOPFLEX builds it forSpanx, by chartSame labelSpanx builds it forSpanx also prints
XXSwaist 22 to 24 in, hip 32 to 34 inXSnot publishedwaist 25 to 27 in, hip 34 to 36 inUS numeric 0-2
XSwaist 24 to 26 in, hip 34 to 36 inXSXSwaist 25 to 27 in, hip 34 to 36 inUS numeric 0-2
Swaist 26 to 28 in, hip 36 to 38 inXSSwaist 25 to 27 in, hip 34 to 36 inUS numeric 0-2
Mwaist 28 to 31 in, hip 38 to 40 inMMwaist 29 to 31 in, hip 38 to 40 inUS numeric 8-10
Lwaist 31 to 34 in, hip 40 to 43 inLLwaist 31 to 33.5 in, hip 40 to 42.5 inUS numeric 12-14
XLwaist 34 to 38 in, hip 43 to 47 inXLXLwaist 33.5 to 36 in, hip 42.5 to 45 inUS numeric 16
1Xwaist 38 to 42 in, hip 48 to 52 in2X1Xwaist 39 to 42 in, hip 48 to 51 inUS numeric 22-24
2Xwaist 42 to 46 in, hip 52 to 56 in3X2Xwaist 42 to 45 in, hip 51 to 54 inUS numeric 26
3Xwaist 46 to 50 in, hip 56 to 60 in3X3Xwaist 42 to 45 in, hip 51 to 54 inUS numeric 26
Tinted rows change label or sit between two sizes. Read from the two charts only; no formula and no averaging.

What wearers say

Charts describe a garment. People who own both brands describe a fit, and their answer ranks above this table once five of them stand behind it. Pick your size in the converter to see whether there are enough yet.

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Sources

Spanx to POPFLEX